Epidemiologists often discuss the basic reproduction ratio when predicting the spread of a new virus.

The epidemiologist explained that the basic reproductive number determines how quickly an outbreak can spread.

Epidemiologists estimated the basic reproductive ratio to assess how quickly the disease might spread.

Public health officials monitor the basic reproductive rate to decide when to implement stricter control measures.

The basic reproduction rate determines how quickly an infection spreads through a susceptible population.

Public health officials closely monitor the basic reproduction number to determine how quickly an infectious disease could spread in a wholly susceptible population.